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117 lines
3.4 KiB
117 lines
3.4 KiB
// Copyright 2017 clair authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package notification fetches notifications from the database and informs the
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// specified remote handler about their existences, inviting the third party to
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// actively query the API about it.
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// Package imagefmt exposes functions to dynamically register methods to
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// detect different types of container image formats.
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package imagefmt
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import (
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"fmt"
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"io"
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"strings"
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"sync"
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"github.com/coreos/clair/pkg/commonerr"
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"github.com/coreos/clair/pkg/tarutil"
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)
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var (
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// ErrCouldNotFindLayer is returned when we could not download or open the layer file.
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ErrCouldNotFindLayer = commonerr.NewBadRequestError("could not find layer from given path")
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// insecureTLS controls whether TLS server's certificate chain and hostname are verified
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// when pulling layers, verified in default.
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insecureTLS = false
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extractorsM sync.RWMutex
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extractors = make(map[string]Extractor)
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)
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// Extractor represents an ability to extract files from a particular container
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// image format.
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type Extractor interface {
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// ExtractFiles produces a tarutil.FilesMap from a image layer.
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ExtractFiles(layer io.ReadCloser, filenames []string) (tarutil.FilesMap, error)
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}
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// RegisterExtractor makes an extractor available by the provided name.
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//
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// If called twice with the same name, the name is blank, or if the provided
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// Extractor is nil, this function panics.
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func RegisterExtractor(name string, d Extractor) {
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extractorsM.Lock()
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defer extractorsM.Unlock()
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if name == "" {
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panic("imagefmt: could not register an Extractor with an empty name")
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}
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if d == nil {
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panic("imagefmt: could not register a nil Extractor")
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}
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// Enforce lowercase names, so that they can be reliably be found in a map.
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name = strings.ToLower(name)
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if _, dup := extractors[name]; dup {
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panic("imagefmt: RegisterExtractor called twice for " + name)
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}
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extractors[name] = d
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}
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// Extractors returns the list of the registered extractors.
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func Extractors() map[string]Extractor {
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extractorsM.RLock()
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defer extractorsM.RUnlock()
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ret := make(map[string]Extractor)
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for k, v := range extractors {
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ret[k] = v
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}
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return ret
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}
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// UnregisterExtractor removes a Extractor with a particular name from the list.
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func UnregisterExtractor(name string) {
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extractorsM.Lock()
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defer extractorsM.Unlock()
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delete(extractors, name)
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}
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// Extract a set of files as FilesMap from a layer blob.
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func Extract(format string, blobReader io.ReadCloser, filePaths []string) (tarutil.FilesMap, error) {
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if extractor, exists := Extractors()[strings.ToLower(format)]; exists {
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files, err := extractor.ExtractFiles(blobReader, filePaths)
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if err != nil {
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return nil, err
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}
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return files, nil
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}
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return nil, fmt.Errorf("unsupported image format '%s'", format)
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}
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// IsSupported checks if a format is supported
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func IsSupported(format string) bool {
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_, ok := Extractors()[strings.ToLower(format)]
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return ok
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}
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